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The production process of sodium silicate is based on batchwise operations. Sodium silicate can be produced by dissolving silica in molten sodium carbonate. It can also be produced in a reactor, by treating a mixture of caustic soda, water and silica in the form of quartz sand with hot steam.
The results of this study establish the foundation of green and clean foundry technology based on the microwave heating hardening sodium silicate sand process. The sodium silicate bonded sand hardened by microwave heating has many advantages,such as low sodium silicate adding quantity,fast hardening speed,high room temperature strength,good collapsibility and certain surface stability.
Dec 01, 2016#0183;#32;For a pure sodium silicate, microwave radiation created a white structure as shown in schematic Fig. 1B. The volume of the pure sodium silicate was expanded more than . However, the temperature was not increased beyond 230 #176;C. The sodium silicate was a good thermal insulator and heat could not accumulate and finally dissipated . After the microwave radiation,
An easy hardening method of sodium silicate sands, estermicrowave composite hardening, could decrease the sands mould absorbing moisture and the mould materials requirement. And it was performed by hardening the sodium silicate sands with a little ester, and then demoulding, finally hardening the nonmold sands with microwave energy.
To study the high moisture absorbability of the sodium silicate boned sand hardened by microwave heating, a new special waterbased coat sprayed on the surface of the sand samples hardened by the first microwave heating and then sintered by the second microwave heating to form a compact coating layer was studied. The results showed that humidity resistance of the sand samples with the coating
CO2 hardened and microwave heating hardened to composite hardened process of sodium silicate sand has been proposed in this paper. Through optimization of air temperature, blowing time, microwave
Hygroscopic mechanism research of sodium silicate sand is not enough. CO2 hardened and microwave heating hardened to composite hardened process of sodium silicate sand has been proposed in this...
The conventional drying (oven drying) method used for the preparation of precipitated mesoporous silica with low surface area (gt;300 m 2 /g) and small pore volume is often associated with a high production cost and a time consuming process. Therefore, the main goal of this study was to develop a costeffective and fast drying process for the production of precipitated mesoporous silica using
Strong hygroscopic of sodium silicate sand is a key problem in the practical application. Hygroscopic mechanism research of sodium silicate sand is not enough. CO 2 hardened and microwave heating hardened to composite hardened process of sodium silicate sand has been proposed in this paper. Through optimization of air temperature, blowing time, microwave power and heating time, get the
Jul 31, 2019#0183;#32;Liu Fuchu, Fan Zitian, Liu Xinwang, et al. Research on humidityresistance of Sodium Silicate Sand Hardened by Twice Microwave Heating Process. Advanced Manufacturing Processes, 2014, 29(2): 4. Google Scholar
Sodium silicate is a generic name for chemical compounds with the formula Na 2x Si y O 2y+x or (Na 2 O) x #183; (SiO 2) y, such as sodium metasilicate Na 2 SiO 3, sodium orthosilicate Na 4 SiO 4, and sodium pyrosilicate Na 6 Si 2 O anions are often compounds are generally colorless transparent solids or white powders, and soluble in water in various amounts.
Jul 01, 2018#0183;#32;Strong hygroscopic of sodium silicate sand is a key problem in the practical application. Hygroscopic mechanism research of sodium silicate sand is not enough. CO 2 hardened and microwave heating hardened to composite hardened process of sodium silicate sand has been proposed in this paper. Through optimization of air temperature, blowing time, microwave power and heating time, get
hydrated sodium silicate hardened by microwave technology. The aim of the research was to develop an optimal sand composition that would provide the strength necessary to make a mould capable of withstanding the modified ablation casting process. At the same time,
In this research, sodium silicate (Na2SiO3) was prepared by rice husk ash reacted with 10 M sodium hydroxide. The mixtures were heated by microwave at 400, 600, and 800 watt for 5 and 10 minutes. The formation of sodium silicate was characterized by Fourier transform infrared spectrophotometer. The vibrations of (Na)OSiO(Na) and OSiO were observed at 595 and cm1
Further research on the impact of microwave penetration depth into the moulding sand with sodium silicate on the process of microwave heating will be carried out with regard to temperature, type of sodium silicate and type of grain. Acknowledgement.
In the process of microwave hardened sodium silicate sand of materials and equipment research and development has been more mature, the quantity of adding sodium silicate can be dropped to %, sand mold have good pieces. Microwave hardened sodium silicate sand advantages obviously, but strong hygroscopic [9].
sand) when the sodium silicate bonded sand was hardened by CO 2, it is reduced to % % by ester hardening [14], while the adding quantity of sodium silicate binder is only % 2% for microwave heating hardening. This will basically solve the puzzles of the sodium silicate bonded sand process mentioned above [1]. Therefore, this microwave heating hardening
The sodium silicate sand hardened by microwave heating has many advantages including high compression strength, high hardening speed, less addition of sodium silicate and low residual strength.
May 27, 2018#0183;#32;Pure sodium silicate is a white powder, if it''s made using the aqueous method then you''re reacting caustic soda, sand and water to get the liquid form. Edit:Looks like I was guessing correctly: according to Wikipedia, heating liquid sodium silicate above 105 degrees C or 221 deg F will drive off water and make it go into quot;Glass phasequot; and solidify.
Paperboard packaging material for use in the manufacture of containers or inserts for containers for browning and crisping food in a microwave oven is prepared on a press. The components of the packaging material include paperboard or an equivalent microwave transparent substrate, a susceptor layer prepared from a printable aqueous susceptorink composition, and an intermediate
Oct 22, 2015#0183;#32;Systematic studies on the preparation of sodiumsilicate solutions of different compositions via the hydrothermalmicrowave treatment of perlite with an NaOH solution were performed. The effect of various factors on the degree of SiO2 recovery and the reaction rate was studied. The application of microwave energy was established to intensify the process of
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May 25, 1982#0183;#32;Sodium silicates are produced by melting sodium carbonate with silica, (SiO 2), at silica:soda (SiO 2:Na 2 O) ratios varying from 1:1 to :1 adjustable by adding lime (NaOH) to the molten material. The molten glass is then quenched and dissolved in water. While most silicates used in foundry are purchased in the liquid form, solid hydrous products, produced by flash evaporation are
Properties, Production and Uses of Sodium Silicate
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